SIONNA THERAPEUTICS INC

Ticker: SION CUSIP: 829401108 Class: Common Stock

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 3,195,181 Value ($000) $131,450 Avg Close $37.92 Range $24.65 - $45.00

Q3 2025

Shares 3,195,181 Value ($000) $93,970 Avg Close $21.76 Range $16.14 - $30.61

Q2 2025

Shares 3,195,181 Value ($000) $55,436 Avg Close $13.10 Range $7.25 - $18.85

Q1 2025

Shares 2,952,754 Value ($000) $30,886 Avg Close $16.34 Range $10.27 - $25.19

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	3,195,181	$131,450	$37.92	$24.65 - $45.00
Q3 2025	3,195,181	$93,970	$21.76	$16.14 - $30.61
Q2 2025	3,195,181	$55,436	$13.10	$7.25 - $18.85
Q1 2025	2,952,754	$30,886	$16.34	$10.27 - $25.19